Scheelite

scheelite

wulfenite

hubnerite

ferberite

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Formula: Ca(WO4) tungstate
Specific gravity: 5.9 - 6.1
Hardness: 4½ to 5
Streak: White
Colour: Tan, golden-yellow, colourless, white, greenish, dark brown, etc.; colourless in transmitted light May be compositionally colour zoned.
Solubility: Slightly soluble in hydrochloric acid
Common impurities: Mo,Nb,Ta
Environments:

Plutonic igneous environments
Pegmatites
Placer deposits
Metamorphic environments (common)
Hydrothermal environments

Scheelite is a primary mineral found in granite pegmatites and also a secondary mineral in contact metamorphic deposits and in the oxidation zone of hypothermal (high temperature) hydrothermal veins in granitic rocks and in alluvial deposits.
In contact metamorphic environments it may be associated with molybdenite. In hydrothermal veins it is associated with apatite, arsenopyrite, cassiterite, fluorite, topaz and hübnerite-ferberite.

Localities

The Two Mile and Three Mile deposits, Paddy's River, Paddys River District, Australian Capital Territory, Australia, are skarn deposits at the contact between granodiorite and volcanic rocks. Scheelite is a primary oxide that occurs at the Two Mile deposit in massive and granular forms in magnetite and amphibole skarn. Rare green plates of scheelite with langite have been observed in magnetite (AJM 22.1.38).

At Trumbull, Fairfield county, Connecticut, USA, wulfenite pseudomorphs after scheelite have been found (KL p217).

At Long Hill, Haddam, Middlesex county, Connecticut, USA, ferberite pseudomorphs after scheelite have been found (KL p215).

At the Gold Hill District, Deep Creek Mountains, Tooele county, Utah, USA, cuprotungstite pseudomorphs after scheelite have been found (KL p218).

Alteration

Scheelite may form as an alteration product of ferberite (AJM 18.2.26).

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